//引用类型- Object
var person = new Object();
person.name = 'guojing';
person.age = 18;
//console.log(typeof person.age);

// Aarry;
var colors = new Array();
colors = ['red', 'black', 'blue'];
//利用length翔末尾添加
colors[colors.length] = 'orange';
console.log(colors);
//检测数组
if(colors instanceof Array) {
	console.log('this is a array');

}

// Date
console.log(Date.now());